The quality of CuMasks is assured, with all masks sterilised with ozone before they are packed, the Innovation & Technology Bureau said.

The bureau pointed out the manufacturer responsible for the mass production of the masks is certified to the ISO 9001 quality management system and that quality control is in place during production.

If any defects are found in the masks, they will not pass the quality requirement.

The bureau pointed out that the masks should be properly handled. They should be rinsed with clean water and soap daily.

Do not twist, wring, iron or tumble-dry CuMasks. Lay it flat until it is thoroughly dry before putting it away, it added.